Comprehensive Interpretation

الآية رقم (177) - إِنَّ الَّذِينَ اشْتَرَوُاْ الْكُفْرَ بِالإِيمَانِ لَن يَضُرُّواْ اللّهَ شَيْئًا وَلهُمْ عَذَابٌ أَلِيمٌ

(177) - {Indeed, those who purchase disbelief [in exchange] for faith - never will they harm Allah at all, and for them is a painful punishment.}

Those who exchanged the faith with disbelief, will not harm Allah (swt) by their disbelief and their apostasy from their belief in anything, rather they will harm themselves by that, for they will bring to themselves, through their disbelief, a punishment from Allah (swt) that they cannot bear.